eINIT is an alternative init system. It's quite fast, since it can potentially be used without the help of any scripting at all, but it is still flexible and extremely modular. The focus is on speed and parallelisation, mostly with embedded devices and low-downtime servers in mind, and benchmarks do suggest that it's doing a fairly good job at that. It compiles cleanly (and should thus work, provided someone writes appropriate modules) on Linux, FreeBSD, and Darwin/Mac OS X.
OpenBSD Live-CD Firewall is an OpenBSD-based pf (packet filter) firewall, with NAT, squid, DNS, and a DHCP server (dnsmasq) for internal clients preconfigured. Settings and log files can be saved to a USB device. Saved settings will be restored at the next reboot. Additional security related software is available on the CD (arpwatch, honeyd, ntop, portsentry, etc.)
Ficl (Forth inspired command language) is an ANS Forth interpreter written in C. Unlike traditional Forths, this interpreter is designed to be embedded into other systems as a command/macro/development prototype language. Ficl provides object extensions that can be used to wrap methods and structures of the host system without altering them.